In order to monitor curing process of epoxy resin in real time,the system based on fiber Bragg grating (FBG) is established .A bare FBG,a FBG packaged with quar tz capillary and an accurate resistance thermometer are immersed into the mixtur e of epoxy resin and curing agent,and are used to monitor the whole curing process.The change of temperature inside epoxy resin is det ected by the resistance thermometer. Meanwhile,the reflection wavelengths of two fiber Bragg gratings are measured by the spectrum analyzer. Experimental results indicate that the temperature evolution monitored by the FB G packaged with quartz capillary is the same as that measured by the resistance thermometer.D uring curing process,inner strain changes of epoxy resin can be taken in by the variation of wavelength difference between FBGs.At the beginning of polymerization reaction,the strain inside epoxy resin quickly increases,and then gradually tend s to a constant value.The temperature sensitivity of the FBG embedded with epoxy resin is 5.3times of tha t of the FBG packaged with quartz capillary when temperature is lower than the glass transition temperature,and 2.2times wh en temperature is higher than the glass transition temperature.